vsf_err_t m45x_i2c_init(uint8_t index);
vsf_err_t m45x_i2c_fini(uint8_t index);
vsf_err_t m45x_i2c_config(uint8_t index, uint16_t kHz, void *param,
							void (*callback)(void *, int32_t, int32_t));
vsf_err_t m45x_i2c_xfer_nb(uint8_t index, uint16_t chip_addr,
							uint8_t read_first,
							uint8_t *read, uint16_t read_len,
							uint8_t *write, uint16_t write_len);

